PARPBP and granular cell tumor: In detail, the GCT cell lines presented as more sensitive to palbociclib (LD50 range: 2.76–24.85 μM) than ribociclib (LD50 range: 14.58–43.65 μM), and among the different GCT entities, choriocarcinoma cell lines presented as least sensitive to PaRi (palbociclib average LD50: 19.67 μM; ribociclib average LD50: 40.02 μM) (Fig. 2).